23.1: Fast‐Switching LCD with Multi‐Domain Vertical Alignment Driven by an Oblique Electric Field

Abstract

We have developed a novel fast-switching LCD with multidomain vertical alignment driven by an oblique electric field. The oblique electric field is applied between comb-shaped source electrodes and comb-shaped common electrodes on a TFT substrate and an ITO electrode on a CF substrate covering the entire display area. The ITO electrode is covered by a dielectric layer. The LCD has a wide viewing range (>160°), a high contrast ratio (>250:1) and fast response times even in black-and-white (13 ms (rise), 4 ms (decay)), and gray-scale (<17 ms) switching.The LCD has no problems with electrostatic charge, disclination, or slow gray-scale switching.

Latest Liquid Crystal Technology

“…However, in the vertical orientation, liquid crystals having a positive dielectric anisotropy can be used for in-plane switching (for details, we refer to the cited literature [27]). Since the electric field is concentrated near the electrodes, low gray levels can be displayed by just driving only a part of the liquid crystals.…”

“…Mr. Nakanishi was so fascinated. There, the formal active cooperation was started to manufacture TFT-LCD prototypes in cooperation with the factory for mass production [27,28]. The response speed was fast (especially in the low gradient regime it was ten times faster than a MVA device), and the viewing angle characteristics were good with very little color change.…”

Continuous Viewing Angle Distribution Control of Liquid Crystal Displays Using Polarization-Dependent Prism Array Film Stacked on Directional Backlight Unit

“…Over decades, many efforts have been devoted to obtain wide viewing angle (WVA) LCDs and significant improvement has been achieved, especially for large-area panels, with the development of several WVA LC modes such as multi-domain vertical alignment (MVA) [1][2][3], patterned vertical alignment (PVA) [4,5], optically compensated bend (OCB) [6][7][8], and in-plane switching (IPS) LC modes [9][10][11][12]. Improvement on optical compensation films also helped in realizing WVA LCDs [13,14].…”

Liquid crystal VAN tilt bias by surface relief patterning

“…The same authors then put these edge field effects to good use by replacing the lower protrusions of Takeda et al with slits in the lower electrodes to form 'virtual protrusions'. Yoshida et al used dielectric layers on the substrates to engineer the field lines of an in-plane switching VAN cell [7]. The layers allowed the production of multiple domains by controlled oblique fields.…”

“…The presence of the features modifies the electric field lines around the underlying pixel electrodes. The angle between electric field lines and LC director have a strong effect on the direction in which the director will reorient [ 7,8,9]. This is especially important in the dip case where the shape of the electric field can oppose and override the effect of the surface feature anchoring.…”